Makepkgs - add configure --libexecdir=/usr/lib for Linux
Makepkgs - add configure --libexecdir=/usr/lib for Linux

All of the packaged builds (rpm, dpkg, ...) do this now ... so do the
same for the tar builds (the only ones that use configure options from
Makepkgs) for platforms where we don't know how to make real packages
as yet.

andyvand/cygpcpfans,ryandoyle/pcp_original,adfernandes/pcp,aeg-aeg/pcpfans,aeg-aeg/pcpfans,aeg-aeg/pcpfans,wuliming/pcp,aeg-aeg/pcpfans,mbaldessari/pcp,mbaldessari/pcp,tjanez/pcp,mbaldessari/pcp,wuliming/pcp,mbaldessari/pcp,wuliming/pcp,ryandoyle/pcp_original,ryandoyle/pcp_original,tjanez/pcp,tjanez/pcp,mbaldessari/pcp,adfernandes/pcp,adfernandes/pcp,andyvand/cygpcpfans,wuliming/pcp,andyvand/cygpcpfans,ryandoyle/pcp_original,prasincs/pcp,adfernandes/pcp,andyvand/cygpcpfans,wuliming/pcp,prasincs/pcp,edwardt/pcp,andyvand/cygpcpfans,ryandoyle/pcp_original,ryandoyle/pcp_original,edwardt/pcp,mbaldessari/pcp,wuliming/pcp,edwardt/pcp,adfernandes/pcp,edwardt/pcp,ryandoyle/pcp_original,tjanez/pcp,wuliming/pcp,prasincs/pcp,prasincs/pcp,prasincs/pcp,prasincs/pcp,tjanez/pcp,adfernandes/pcp,aeg-aeg/pcpfans,adfernandes/pcp,edwardt/pcp,tjanez/pcp,adfernandes/pcp,tjanez/pcp,wuliming/pcp,aeg-aeg/pcpfans,tjanez/pcp,ryandoyle/pcp_original,edwardt/pcp,aeg-aeg/pcpfans,prasincs/pcp,aeg-aeg/pcpfans,andyvand/cygpcpfans,edwardt/pcp,andyvand/cygpcpfans,andyvand/cygpcpfans,prasincs/pcp,edwardt/pcp